fessenden oscillator การใช้

• The later Fessenden oscillator allowed communication with submarines.
• Some submarines contained Fessenden oscillator systems.
• The ten Montreal-built British H class submarines launched in 1915 were equipped with a Fessenden oscillator.
• Unlike previous underwater sound sources such as underwater bells, the Fessenden oscillator was reversible; the AC winding could be connected to a head set and underwater sounds and echoes could be heard.
• While there, he helped develop a type of sonar system, the Fessenden oscillator, for submarines to signal each other, as well as a method for locating icebergs, to help avoid another disaster like the one that sank " Titanic ".
• The Canadian engineer Reginald Fessenden, while working for the Submarine Signal Company in Boston, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U . S . Revenue ( now Coast Guard ) Cutter Miami on the Grand Banks off Fessenden oscillator, at ca . 500 Hz frequency, was unable to determine the bearing of the berg due to the 3 metre wavelength and the small dimension of the transducer's radiating face ( less than 1 metre in diameter ).